I travelled Holland in the summer of 2001, the same time I travelled in Belgium. We stayed in the city of Amsterdam for 3 days. We visited many places in Holland like Roterdam, Madurodam etc.
Holland is a unique country in the world in the sense that it's situated on or below the sea level. It's also the biggest exporter of flowers. There are hugh flower guardens in Holland, Kokenholf, one of the major ones. We visited this guarden and saw the millions of full bloom Tulips. There are hundreds of varities of tulips here.